BUITING, M. S. Bloemgarten, Henri Polak, sociaal democraat, 1868-1943. BMGN - Low Countries Historical Review, [S. l.], v. 110, n. 1, p. 141–143, 1995. DOI: 10.18352/bmgn-lchr.3985. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104584. Acesso em: 24 feb. 2024.